History of the Peloponnesian War

But the Corinthians and allies had started for Acarnania without any idea of fighting at sea, and with vessels more like transports for carrying soldiers; besides which, they never dreamed of the twenty Athenian ships venturing to engage their forty-seven. However, while they were coasting along their own shore, there were the Athenians sailing along in line with them; and when they tried to cross over from Patrae in Achaea to the mainland on the other side, on their way to Acarnania, they saw them again coming out from Chalcis and the river Evenus to meet them. They slipped from their moorings in the night, but were observed, and were at length compelled to fight in mid passage.